feat(feature): add OCI pull retry with URL sanitization

[skevetter]

Summary

• Add retry logic (3 attempts with 1s/2s/4s exponential backoff) to OCI feature image pulls, only retrying on transient errors (5xx, network failures) — not on 4xx
• Sanitize registry URLs in all error messages to show hostname only (e.g. ghcr.io instead of full path)
• Extract pullOCIImage helper to keep function complexity under the linter threshold

[netlify]

✅ Deploy Preview for devsydev canceled.

Name	Link
🔨 Latest commit	6ae8131
🔍 Latest deploy log	https://app.netlify.com/projects/devsydev/deploys/69f740e6e95e8f00084400c4

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 186497d6-9a1b-4698-bbd0-62a787440398

📥 Commits

Reviewing files that changed from the base of the PR and between 11158bb and 6ae8131.

📒 Files selected for processing (8)

• cmd/up.go
• pkg/devcontainer/build/options_test.go
• pkg/devcontainer/feature/features.go
• pkg/devcontainer/feature/features_oci_test.go
• pkg/devcontainer/feature/oci_retry.go
• pkg/devcontainer/feature/oci_retry_test.go
• pkg/devcontainer/feature/sanitize.go
• pkg/devcontainer/feature/sanitize_test.go

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